Smart Home & Consumer IoT Hardware worked example

Rework Cost at 4.6% defect rework rate: a worked example in smart home & consumer iot hardware

Push defect rework rate up to 4.6% and the picture changes. This example computes every intermediate figure at that operating point. A manufacturing engineer quantifies expected rework cost on a connected-device build to weigh it against scrap or tighter process control.

The inputs for this scenario

  • Units built in the production run: 30,000 units (unchanged)
  • Rework labor + parts per defective unit: 9.75 $/unit (unchanged)
  • Defect rework rate (units needing rework): 4.6 % (raised for this scenario; the documented default is 4)
  • One-time line setup for rework: 3,500 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Rework Cost = Units Built x Rework Labor+Parts x Defect Rework Rate% + Line Setup) to the inputs above produces each figure below.
  • At this operating point the engine returns 16,955 $ for total rework cost, the number this scenario is built around.
  • At this operating point the engine returns 0.57 $ / piece for rework cost per unit.
  • At this operating point the engine returns 13,455 $ for variable rework cost.
  • At this operating point the engine returns 3,500 $ for fixed rework cost adder.

How this compares with the baseline

  • Against the tool's baseline example, where defect rework rate sits at 4% and the headline result is 15,200 $, this scenario comes in 11.55% above the baseline at 16,955 $.
  • It computes total rework cost from run size, per-unit rework cost, defect rate and fixed setup, and amortizes it to a per-unit figure. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Total rework cost: 16,955 $ (headline result)
  • Rework cost per unit: 0.57 $ / piece
  • Variable rework cost: 13,455 $
  • Fixed rework cost adder: 3,500 $

Run it with your numbers

  • Every input above is editable in the live Rework Cost calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.